Windows: Don't try to center a popup over a parent window when the popup is bigger than the parent.

ui/base/win/hwnd_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/win/hwnd_util.h"
 
 #include "base/i18n/rtl.h"
 #include "base/string_util.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace ui {
 
 namespace {
 
-// Adjust the window to fit, returning true if the window was resized or moved.
+// Adjust the window to fit.
 void AdjustWindowToFit(HWND hwnd, const RECT& bounds, bool fit_to_monitor) {
   if (fit_to_monitor) {
     // Get the monitor.
     HMONITOR hmon = MonitorFromRect(&bounds, MONITOR_DEFAULTTONEAREST);
     if (hmon) {
       MONITORINFO mi;
       mi.cbSize = sizeof(mi);
       GetMonitorInfo(hmon, &mi);
       gfx::Rect window_rect(bounds);
       gfx::Rect monitor_rect(mi.rcWork);
@@ skipping 100 matching lines @@
     HMONITOR monitor = MonitorFromWindow(window, MONITOR_DEFAULTTONEAREST);
     if (monitor) {
       MONITORINFO mi = {0};
       mi.cbSize = sizeof(mi);
       GetMonitorInfo(monitor, &mi);
       center_bounds = mi.rcWork;
     } else {
       NOTREACHED() << "Unable to get default monitor";
     }
   }
-  window_bounds.left = center_bounds.left +
-      (center_bounds.right - center_bounds.left - pref.width()) / 2;
+
+  window_bounds.left = center_bounds.left;
+  if (pref.width() < (center_bounds.right - center_bounds.left)) {
+    window_bounds.left +=
+        (center_bounds.right - center_bounds.left - pref.width()) / 2;
+  }
   window_bounds.right = window_bounds.left + pref.width();
-  window_bounds.top = center_bounds.top +
-      (center_bounds.bottom - center_bounds.top - pref.height()) / 2;
+
+  window_bounds.top = center_bounds.top;
+  if (pref.height() < (center_bounds.bottom - center_bounds.top)) {
+    window_bounds.top +=
+        (center_bounds.bottom - center_bounds.top - pref.height()) / 2;
+  }
   window_bounds.bottom = window_bounds.top + pref.height();
 
   // If we're centering a child window, we are positioning in client
   // coordinates, and as such we need to offset the target rectangle by the
   // position of the parent window.
   if (::GetWindowLong(window, GWL_STYLE) & WS_CHILD) {
     DCHECK(parent && ::GetParent(window) == parent);
     POINT topleft = { window_bounds.left, window_bounds.top };
     ::MapWindowPoints(HWND_DESKTOP, parent, &topleft, 1);
     window_bounds.left = topleft.x;
@@ skipping 15 matching lines @@
   if (base::i18n::IsRTL())
     flags |= TPM_RIGHTALIGN;
   HMENU system_menu = GetSystemMenu(window, FALSE);
   int command = TrackPopupMenu(system_menu, flags, screen_x, screen_y, 0,
                                window, NULL);
   if (command)
     SendMessage(window, WM_SYSCOMMAND, command, 0);
 }
 
 }  // namespace ui